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#include <stdlib.h>
#include <stdio.h>
#include <memory.h>
#include "obj.h"
ObjModel* ObjLoadModel(char *memory, size_t size)
{
char *p = NULL, *e = NULL;
ObjModel *ret = (ObjModel *) calloc(1, sizeof(ObjModel));
memset(ret, 0, sizeof(ObjModel));
p = memory;
e = memory + size;
while (p != e)
{
if (memcmp(p, "vn", 2) == 0) ret->nNormal++;
else if (memcmp(p, "vt", 2) == 0) ret->nTexCoord++;
else if (memcmp(p, "v", 1) == 0) ret->nVertex++;
else if (memcmp(p, "f", 1) == 0) ret->nTriangle++;
while (*p++ != (char) 0x0A);
}
ret->VertexArray = (ObjVertex *) malloc(sizeof(ObjVertex) * ret->nVertex);
ret->NormalArray = (ObjNormal *) malloc(sizeof(ObjNormal) * ret->nNormal);
ret->TexCoordArray = (ObjTexCoord *) malloc(sizeof(ObjTexCoord) * ret->nTexCoord);
ret->TriangleArray = (ObjTriangle *) malloc(sizeof(ObjTriangle) * ret->nTriangle);
p = memory;
int nV = 0, nN = 0, nT = 0, nF = 0;
while (p != e)
{
if (memcmp(p, "vn", 2) == 0)
{
sscanf(p, "vn %f %f %f", &ret->NormalArray[nN].x,
&ret->NormalArray[nN].y,
&ret->NormalArray[nN].z);
nN++;
}
else if (memcmp(p, "vt", 2) == 0)
{
sscanf(p, "vt %f %f", &ret->TexCoordArray[nT].u,
&ret->TexCoordArray[nT].v);
nT++;
}
else if (memcmp(p, "v", 1) == 0) /* or *p == 'v' */
{
sscanf(p, "v %f %f %f", &ret->VertexArray[nV].x,
&ret->VertexArray[nV].y,
&ret->VertexArray[nV].z);
nV++;
}
else if (memcmp(p, "f", 1) == 0) /* or *p == 'f' */
{
sscanf(p, "f %d/%d/%d %d/%d/%d %d/%d/%d", &ret->TriangleArray[nF].Vertex[0],
&ret->TriangleArray[nF].TexCoord[0],
&ret->TriangleArray[nF].Normal[0],
&ret->TriangleArray[nF].Vertex[1],
&ret->TriangleArray[nF].TexCoord[1],
&ret->TriangleArray[nF].Normal[1],
&ret->TriangleArray[nF].Vertex[2],
&ret->TriangleArray[nF].TexCoord[2],
&ret->TriangleArray[nF].Normal[2]);
nF++;
}
while (*p++ != (char) 0x0A);
}
return ret;
}
size_t ObjLoadFile(char *szFileName, char **memory)
{
size_t bytes = 0;
FILE *file = fopen(szFileName, "rt");
if (file != NULL)
{
fseek(file, 0, SEEK_END);
size_t end = ftell(file);
fseek(file, 0, SEEK_SET);
*memory = (char *) malloc(end);
bytes = fread(*memory, sizeof(char), end, file);
fclose(file);
}
return bytes;
}
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